Hi all,
Like a few others on this forum I did not create a build log for two reasons. (1) I get too involved in the process of building and fixing my blunders, (2) My phone has a very ordinary (pathetic) camera. Oh, and (3) I'm lazy.
The blunders occurred whilst doubling the size and converting to metric on the fly plus inattention or getting carried away with making swarf.
For some reason I managed to get a step in the cylinder bore that I just could not remove completely so spent seemingly ages working around it. Ended up creating an "O" ring from bathroom silicone sealant as the regular variety of ring was too firm and if adjusted for the smaller dia of the step was too loose at the top end.
The short story of making the "O" ring is simply smearing the top end of the cylinder bore with oil. plonking the silicone on the piston to more than fill the groove. Then pushing the piston into the cylinder bore and going inside for dinner. In the morning I simply removed piston and trimmed the daggy bits with a sharp blade. Reassemble and test run, joy oh joy it worked 4 PSI = Job Done.
If that had not worked I was going to remake the cylinder. Who's a happy chappy then?
Anyway here is a very short video of the final effort running on about 5 PSI.
Oh, and I shall try and add the test run video too.